Google's prototypes have covered over a million kilometers on the road. They have also had to deal with unexpected situations, such as a child driving a toy car in the road, and a woman in an electric wheelchair chasing a duck. In each case, the car reacted safely.

　　Some are not convinced. Sven Beiker of Stanford University thinks driverless cars will still need human input in extreme circumstances.

　　语篇解读：本文是一篇说明文。无人驾驶汽车尽管能够减少交通事故和交通堵塞，但是，它的安全性还有待验证。

　　1．According to Paragraph 1, what is the author's chief concern about driverless cars?

　　A．Functions.B．Safety.

　　C．Price.

　　D．Appearance.

　　解析：选B　细节理解题。根据第一段第三、四句“But would you feel ... in their driverless cars.”可知，作者主要关心的是无人驾驶汽车的安全问题。故选B。

　　2．Chris Urmson mentioned his 11­year­old son in order to show that ________.

　　A．traditional cars are harmful for kids

　　B．his son is not good at driving

　　C．his son is a slow learner in driving

　　D．driverless cars will come soon

　　解析：选D　细节推断题。根据第二段倒数第二、三句可知，Chris Urmson希望他11岁的儿子将来不用参加驾照考试。为了实现这个愿望，无人驾驶汽车须在5年之内上市，即在他的儿子16岁之前。由此可知，Chris Urmson提到他儿子是为了说明无人驾驶汽车很快就能被生产出来。故选D。

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